Grammar, punctuation, spelling
The Web abounds with sites teaching grammar, punctuation, and spelling. Not surprisingly, most of these sites are provided by educational institutions, teachers, or business-writing consultants, presumably to make up for the lack of grammar teaching in so many school systems for the past several decades. Some are tutorials (masquerading as style guides) for technical communicators. Here are a few sites that I have found useful or that other people have recommended to me.
Purdue University Online Writing Lab has handouts and exercises on grammar, spelling, and punctuation, PowerPoint presentations related to grammar, and an entire section of handouts and resources for learners of English as a Second Language. http://owl.english.purdue.edu/handouts/grammar/
Grammar, Punctuation, and Capitalization: A Handbook for Technical Writers and Editors. Very thorough and detailed. http://stipo.larc.nasa.gov/sp7084/sp7084cont.html
Online Technical Writing: Common Grammar, Usage, and Spelling Problems http://www.io.com/~hcexres/textbook/ is part of a course on technical writing by David McMurrey.
The corresponding book is Power Tools for Technical Communication, published by Heinle & Heinle, 2001, ISBN 0155068989, available through Amazon.com.
Guide to grammar and writing http://cctc2.commnet.edu/grammar/
The Tongue Untied: A guide to grammar, punctuation and style http://grammar.uoregon.edu/toc.html
Has exercises and answers, after explanations.
Grammar Bytes! Interactive Grammar Review http://www.chompchomp.com/handouts.htm
An appealing site generous with explanations, handouts, interactive exercises.
The St. Albans Lower School (National Cathedral School for Boys), Washington DC, Form 1 (Seventh grade) grammar pages includes this page of links to diagramming practice exercises: http://www.sta.cathedral.org/lowerschool/form1/Eng1JAVwww/Grammar/Diagramming/
Professional proofreading and editing marks
If you need a refresher on the use of professional proofreading marks, here are two sites you might find helpful. No doubt there are many others.
Inkwell Editorial, http://www.inkwelleditorial.com/proofreaders_marks.htm
University of Colorado at Boulder, http://www.colorado.edu/Publications/styleguide/symbols.html
Last updated 17 August 2007